This product was mentioned in 7 comments, with an average of 1.14 upvotes
I've been using this mount for years (haven't used it with my 6P yet, but should fit).
It allows me to mount my phone on any of my large tripods, or on top of my DSLR (so I can take high res pics, while shooting 4k video, etc.).
You could also use one of those tripod/hot shoe mount splitters, so you can mount various accessories on 1 arm (such as a microphone, phone, light).
I've been using this mount for years (haven't used it with my 6P yet, but should fit).
It allows me to mount my phone on any of my tripods, or on top of my DSLR (so I can take high res pics, while shooting 4k video, etc.).
If you don't mind a slight lag, you can save some money and use an app if you're on Android. I use one of 2 apps that display the live view on my phone and has remote control features.
DSLR Controller is a more basic app that does this. but I prefer qDSLRDashboard as it offers many more features -- just not free and I can't recall the price.
I got a hotshoe mount for my phone like this one, but not this one and a USB OTG adapter like this and connect the phone to my DSLR via USB.
Benefits are the phone (or tablet) then displays my camera's live view, the touch screen becomes the camera's touch screen for things like touch to focus, the apps can control the camera and use their own overlays (I like qDSLRDashboard's focus peaking feature).
Bonus: Both support live view over WiFi and you can install custom firmware on a TP-Link TL-MR3040 portable router, then plug the router into your camera and have wireless control via either app to your camera.
There's a slight delay between the camera and what's displayed on phone, more so over wifi. So if you need precision, this isn't your answer. But if you want something kinda fun and cheaper than a monitor, give this a shot.
You could go this route. It's much cheaper ChargerCity DSLR Hot Shoe Flash Camera Mount for Samsung Galaxy Note 5 4 S5 S6 EDGE Ap... [link]
I use this hot shoe mount to mount my phones to my DSLR. If you unscrew the hot shoe base, you can screw the mount directly onto the tripod head as shown: [link]